102 * 76 = () (simple calculation)

102 * 76 = () (simple calculation)

（100+2）*76=7600+152=7752

Ⅰ1/10－1／9Ⅰ＋Ⅰ1／9－1／8Ⅰ＋Ⅰ1／8－1／7Ⅰ…… I know I'm stupid. But saving a life is better than building a seven level floating butcher. The teacher is terrible. The mother is also terrible. Besides, I'm a vertical line for absolute value. I can't find it
Can you give me a step in the middle

|1/10-1/9|+|1/9-1/8|+|1/8-1/7|.+|1/3-1/2|+|1/2-1|
=1/9-1/10+1/8-1/9+1/7-1/8+.+1/2-1/3+1-1/2
=1-1/10
=9/10

The absolute value formula of the first day of junior high school

|a|=a（a>0） 　　|a|=-a（a